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STICKY FLY PAPER. 1% 534,457. v Patented Feb. 19,1895.-

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while retaining the general height of the dam,

, 00-40, of Fig. 1. I

UNITED STATES QTTO THUM, or GRAND RAPIDS, MICHIGAN, ASSIGNOR, TO o.

' ,THUM 00., or SAME PLACE.

PATENT OFFICE.

: STICKY FLY-PAPER.

SPECIFICATION forming part of Letters Patent No. 534,457, dated February19, 1895.

Application filed June 25, 1894:. Serial No. 515,575. (No specimens.) v

To all whom it may concern:

Be itknown that I, OTTO THUM, a citizen of the United States of America,residing at; Grand Rapids, in the county of. Kent and State of Michigan,have invented certain new and useful Improvements in Sticky Fly-Paper,of which the following is a specification.

The particular class of sticky fly paper, to which my invention pertainsis that in which a dam isformed on the margin of the sheet and about thesoft and stickyor fly catching material, the darn being composed of aresinous or gummy material, sufficiently firm under ordinary atmospherictemperature to restrain the soft interior and to prevent it from flowingoutward, but also sufficiently adhesive to hold itself to the paper, andto yield its hold when the sheets are separated.

' Such a dam or border 'isshown in Letters Patent of the United States,granted May 22, 1883, numbered 278394;. This seal as-heretofore made, isof substantially uniform thickness or depth throughout, and 'when theleaves or sheets between which it is located, are separated, itsometimes is detached from both leaves, and when any considerable lengthof the border or dam is so attached and stands out between theseparating leaves it breaks off, and falls, either upon the stickymaterial on which it is a detriment, or upon the floor. This difficultyI have overcome by reducing the thickness of the border or dam, so that,

above the surface ofthe sticky material, it is still so weakened atintervals that it breaks, at the weakened places, and leaves onlyfragments of such length, that they remain upon the paper, on one sideor the other. I produce this weakening, by transverse corruga-' tionssuch as those illustrated in the accompanying drawings, in which-- vFigure 1 shows thesheet in plan View, and Fig. 2 represents a sectiontaken on line In the drawings the sheet shown is the same or may be thesame'as those now commonly known and sold as sticky fly paper- The sheetis double being composed of two parts a, a, between which is the stickymaterial isthe sealing border 0. This is made of a depth slightlygreater than that of the sticky material, so that the weight of theoverlying material, when the sheets are packed for storage ortransportation, shall rest with greater pressure on the sealing border,than upon the softer adhesive interior, and thus there is a lesstendency to force this softer material outwardly and-to break the sea].

'In order to maintain the required thickness and at the same timeto'prevent the fracture and separation of the border, I have-corrugatedthe border transversely of its length so that it is composed ofalternating thick and thin portions. These are shown in Fig. 2, thethicker portions being at 1, and the thinner at 2. The seal is made ofthe described form preferably by running the flypaper between tworollers having projecting ribs that register with the seal as thepaperpasses through be} tween; said ribs being corrugated or formed, withsuch surfaces as will produce this unevenness in the thickness of seal,the opera tion being performed while the seal isin pliable condition.'When so corrugated the general height or thickness of the border is notlessened notwithstanding that there are thinner intervals. It serves thesame purpose as a dam or retaining'border and in opening the fragmentsof the borderremain upon the paper.

. I claim 1. A sheet of sticky fly paper provided with .a retainingborder composed of sealing mate-1 rial weakened transversely atintervals, substautially as described.

2. Sticky fly paper having retaining border v composed of sealingmaterial transversely corrugated, substantially'as described.

' In testimony whereof I affix my signature in presence of twowitnesses. 1

Witnesses: RICHARD Q. Vos, F. DUNNEBAOKE.

OTTO'THUM. t

